What about left to right direction? (horizontal layout)

The default exported image is from up to down. So, when the dependence packages go large, the width of the image goes wide.
I think it would be better to make it left to right (Or you can do an option), at least as a tree, the depth wouldn't go so far. It is more convenience to scroll from up to down than scroll left to right...
( :) a lot of directions may not confuse you )